/**
 * @license
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
(function() {
  'use strict';

  Polymer({
    is: 'gr-change-star',

    /**
     * Fired when star state is toggled.
     *
     * @event toggle-star
     */

    properties: {
      /** @type {?} */
      change: {
        type: Object,
        notify: true,
      },
    },

    _computeStarClass(starred) {
      return starred ? 'active' : '';
    },

    _computeStarIcon(starred) {
      // Hollow star is used to indicate inactive state.
      return `gr-icons:star${starred ? '' : '-border'}`;
    },

    toggleStar() {
      const newVal = !this.change.starred;
      this.set('change.starred', newVal);
      this.dispatchEvent(new CustomEvent('toggle-star', {
        bubbles: true,
        detail: {change: this.change, starred: newVal},
      }));
    },
  });
})();
